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To reduce this wear and develop a novel artificial hip joint system, we produced a superlubricious metal\u2010bearing material: for this, we grafted a 2\u2010methacryloyloxyethyl phosphorylcholine (MPC) polymer onto the surface of a cobalt\u2013chromium\u2013molybdenum (Co\u2010Cr\u2010Mo) alloy. For ensuring long\u2010term benefit retention of poly(MPC) on the Co\u2010Cr\u2010Mo alloy for application as a novel artificial hip joint system, several issues must be considered: strong bonding between poly(MPC) and Co\u2010Cr\u2010Mo surface, high mobility of free end groups of the poly(MPC) layer, and high density of the introduced poly(MPC). Considering these issues, we introduced a 3\u2010methacryloxypropyl trimethoxysilane (MPSi) intermediate layer and a photoinduced graft polymerization technique to create a strong covalent bond between the Co\u2010Cr\u2010Mo substrate and the poly(MPC) chain via the MPSi layer. The thickness and density of the poly(MPC) layer on the surface increased with the MPC concentration and photoirradiation time. The grafted poly(MPC) layer successfully provided super\u2010lubricity to the Co\u2010Cr\u2010Mo surface. The poly(MPC)\u2010grafted crosslinked polyethylene\/poly(MPC)\u2010grafted Co\u2010Cr\u2010Mo or cartilage\/poly(MPC)\u2010grafted Co\u2010Cr\u2010Mo bearing interface mimicking natural joints showed an extremely low friction coefficient of 0.01, which is as low as that of natural cartilage interface. A superlubricious metal\u2010bearing surface would enable the development of a novel biocompatible artificial hip joint system\u2010artificial femoral head for partial hemiarthroplasty and metal\u2010on\u2010polymer\/metal type for total hip arthroplasty. \u00a9 2008 Wiley Periodicals, Inc. 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